Hi,

I've developed a web service using Apache Axis 1.4 (WSDL shown at the bottom
of this post) which is deployed to Apache Tomcat 5.5. Using VisualStudio.NET
2003 I've created a small .NET (1.1) based test client to invoke one of the
methods. I get the following exception thrown by the client when I invoke
the loginUser method on the web service:

An unhandled exception of type 'System.InvalidOperationException' occurred
in system.xml.dll

Additional information: There is an error in XML document (1, 2457).

Unhandled Exception: System.InvalidOperationException: There is an error in
XML document (1, 2457). ---> System.InvalidCastException: Cannot assign
object of type
VIPerProvisionTest.provision.ServiceDescriptor to an object of type
VIPerProvisionTest.provision.ServiceDescriptor[].

  at
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.fixup_Read4_ServiceList(Object
objFixup)
  at System.Xml.Serialization.XmlSerializationReader.DoFixups()
  at
System.Xml.Serialization.XmlSerializationReader.ReadReferencedElements()
  at
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.Read10_loginUserResponse()

--- End of inner exception stack trace ---

  at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader
xmlReader, String encodingStyle, XmlDeserializationEvents events)
  at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader
xmlReader, XmlDeserializationEvents events)
  at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader
xmlReader)
  at
System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage
message, WebResponse response, Stream responseStream, Boolean asyncCall)
  at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String
methodName, Object[] parameters)
  at VIPerProvisionTest.provision.ProvisionCommandsService.loginUser(String
userName, String password, AuthenticationToken& authtoken, Organisation&
organisation, Boolean& loginUserReturn) in
d:\projects\c++\viperprovisiontest\web
references\provision\reference.cs:line 37
  at VIPerProvisionTest.Form1..ctor() in
d:\projects\c++\viperprovisiontest\form1.cs:line 35
  at VIPerProvisionTest.Form1.Main() in
d:\projects\c++\viperprovisiontest\form1.cs:line 90
The program '[1908] VIPerProvisionTest.exe' has exited with code 0 (0x0).

The problem seems to be with the ServiceList element. I've tried just
defining a ServiceDescriptor array in the WSDL (without the ServiceList
wrapper) but I get the same exception thrown. If I remove the ServiceList
from the definition of Organisation, or I change ServiceList for just a
single ServiceDescriptor, then the method invocation is successful. As far
as I can tell the SOAP response (shown below) emitted by Axis looks ok.

Am I defining the array incorrectly in the WSDL ? Does anyone have any idea
why the .NET SOAP implementation is having a problem handling this response
message ?

Thanks,

Tony

------------------------------------------------------------------------------------------------------------------

SOAP response to loginUser request generated by Apache Axis 1.4:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
                 xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

   <soapenv:Body>

       <ns1:loginUserResponse
soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
                              xmlns:ns1="urn:soap.provision.viper.bt.com">

           <authtoken xsi:type="ns1:AuthenticationToken">
               <SessionID
xsi:type="xsd:string">509171851819014720v1pEr357ws1</SessionID>
           </authtoken>

           <organisation xsi:type="ns1:Organisation">
               <ID xsi:type="xsd:int">1</ID>
               <Name xsi:type="xsd:string">An Organisation</Name>

               <ServiceList xsi:type="ns1:ServiceList">
                   <ServiceDescriptor xsi:type="ns1:ServiceDescriptor">
                       <Name xsi:type="xsd:string">A service</Name>
                   </ServiceDescriptor>
                   <ServiceDescriptor xsi:type="ns1:ServiceDescriptor">
                       <Name xsi:type="xsd:string">Another service</Name>
                   </ServiceDescriptor>
                   <ServiceDescriptor xsi:type="ns1:ServiceDescriptor">
                       <Name xsi:type="xsd:string">Yet another
service</Name>
                   </ServiceDescriptor>
               </ServiceList>

           </organisation>

           <loginUserReturn xsi:type="xsd:boolean">true</loginUserReturn>

       </ns1:loginUserResponse>
   </soapenv:Body>
</soapenv:Envelope>
------------------------------------------------------------------------------------------------------------------

The WSDL for the web service (trimmed for the method and types of interest):

<?xml version="1.0" encoding="UTF-8"?>

<wsdl:definitions targetNamespace="urn:soap.provision.viper.bt.com"
                 xmlns:apachesoap="http://xml.apache.org/xml-soap"
                 xmlns:impl="urn:soap.provision.viper.bt.com"
                 xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
                 xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
                 xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/"
                 xmlns:xsd="http://www.w3.org/2001/XMLSchema">

   <wsdl:types>

       <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
                  targetNamespace="urn:soap.provision.viper.bt.com">

           <xs:complexType name="AuthenticationToken">
               <xs:sequence>
                   <xs:element name="SessionID"
                               type="xs:string"
                               nillable="false"/>
               </xs:sequence>
           </xs:complexType>

           <xs:complexType name="ServiceDescriptor">
               <xs:sequence>
                   <xs:element name="Name"
                               type="xs:string"
                               nillable="false"/>
               </xs:sequence>
           </xs:complexType>

           <xs:complexType name="ServiceList">
               <xs:sequence>
                   <xs:element name="ServiceDescriptor"
                               type="impl:ServiceDescriptor"
                               minOccurs="0"
                               maxOccurs="unbounded"/>
               </xs:sequence>
           </xs:complexType>

           <xs:complexType name="Organisation">
               <xs:sequence>

                   <xs:element name="ID"
                               type="xs:int"
                               nillable="false"/>

                   <xs:element name="Name"
                               type="xs:string"
                               nillable="false"/>

                   <xs:element name="ServiceList"
                               type="impl:ServiceList"
                               minOccurs="1"
                               maxOccurs="1"/>

               </xs:sequence>
           </xs:complexType>

       </xs:schema>
   </wsdl:types>

   <!-- Requests -->

   <wsdl:message name="loginUserRequest">
       <wsdl:part name="userName" type="soapenc:string"/>
       <wsdl:part name="password" type="soapenc:string"/>
   </wsdl:message>

   <!-- Responses -->

   <wsdl:message name="loginUserResponse">
       <wsdl:part name="authtoken" type="impl:AuthenticationToken"/>
       <wsdl:part name="organisation" type="impl:Organisation"/>
       <wsdl:part name="loginUserReturn" type="soapenc:boolean" />
   </wsdl:message>

   <!-- Operations -->

   <wsdl:portType name="provisionCommands">

       <wsdl:operation name="loginUser" parameterOrder="userName password">
           <wsdl:input message="impl:loginUserRequest"
name="loginUserRequest"/>
           <wsdl:output message="impl:loginUserResponse"
name="loginUserResponse" />
       </wsdl:operation>

   </wsdl:portType>

   <!-- Bindings -->

   <wsdl:binding name="provisionSoapBinding" type="impl:provisionCommands">
       <wsdlsoap:binding style="RPC"
transport="http://schemas.xmlsoap.org/soap/http"/>

       <wsdl:operation name="loginUser">
           <wsdlsoap:operation soapAction=""/>
           <wsdl:input name="loginUserRequest">
               <wsdlsoap:body
encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
                              namespace="urn:soap.provision.viper.bt.com"
use="encoded"/>
           </wsdl:input>

           <wsdl:output name="loginUserResponse" >
               <wsdlsoap:body
encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
                              namespace=":urn:soap.provision.viper.bt.com"
use="encoded"/>
           </wsdl:output>
       </wsdl:operation>

   </wsdl:binding>

   <wsdl:service name="ProvisionCommandsService">
       <wsdl:port binding="impl:provisionSoapBinding" name="provision">
           <wsdlsoap:address
location="http://localhost:8080/axis/services/provision"/>
       </wsdl:port>
   </wsdl:service>

</wsdl:definitions>